Fuel-oil injection pump



Dec. 18, .1928.

vK. RASMUSSEN FUEL OIL INJECTION PUMP Filed Aug. 5l, 1927 3 Sheets-Sheet2 amnit- Dec. 18, 192s.-r

FUEL OIL INJECTION PUMP FEASMUSSEN 3 sheets-smet Filed Aug. 5l. 1927"lla Patented Dec. l 1.8, 1928.

l I 1,695,716 ,UNITI-:n STATES PATENT OFFICE.

KRLISCLIAIIT RASMUSS, OF BUFFALO, NEW YORK.

FUEL-OIL INFECTION PUMP.

- Application filed August 31, 1927. se'riai No. 216,619.

This invention relates to-imp rovements in fuel oil injection :pumps foruse with o il burning engines and its principal object is to provide agreatly simplified structure which will be certain and reliable in itsoperation. i

For the attainment of this object the in .venti'on proposes a pumpstiucture which has a single double acting valve element as contrastedwith the 'several structurally independent valve elements of priordevicesand which, if desired, may 'be iitted directly to the cylinder,replacing the usual check valve mechanism at the cylinder inlet.

A further object is to provide an injector pump having the valvecharacteristics described wherein the operation of the valve` elementmay be regulated as desired with respect to the beginning and cessationof the injection and may be automaticallyregulat- Yed with respect totheduration ofthe injection, thereby to enable regulationofthe injection.in .accordance with the speed and load. of theV engine.

Another object is to provide in connectionV with' an injector pump asabove generally described a simple and reliable controlling mechanismoperated from the crank shaft of` the engine.

The invention is illustrated in thefaccompanying drawings in which:

Figure 1 is a vertical sectional view of the injector pump.

Figure 2 is a top plan View thereof.

. Figure 3 is a sectional view showing an alternative detail consistingof a casing made in telescopic sections for the protection of the pumpplunger and cylinder.

Figure 4 is a sectional view showing one form of' operating mechanismfor the pump. Figure 5 is a horizontal sectionon the line 5-5 ofF'igure4. i

. Figure 6 is a vertical section on the line 6 6 of Figure 4.

Figure 7 is a sectional view showing an' alternative form of operatingmechanism for the pump.v y

Figure 8 is a plan View of the same.

Figure 94 is a sectional `view on the line 9 9- of Figure 7.

Figures 10 .and 11 are sectional views on the lines 10410 and ,11-11otFigure 8.

The pump consists of a suitable body or casing 20 having an oil inletpassage 21, an oil discharge passage 22 and a valve cham.- ber 23through which .the oil flows frpm the passage 21 to the passage`22, suchHow being inducedby the pump 24 and controlled casing shown in Figure 3and consisting of an element 31 which is secured to the bodyf 20, and amovable element 32 of cup-like form which fits over tlieelement 31,bearsY against the; head 29 and receives the thrust having an air'andoil vent 33.`

The valve chamber'23 is formed atl its of the operating mechanism, theelement 32 lower end with the valve seat 34 and at its upper end withthe valve seat 35. As shown and preferred, the valve seat 35 is formedon a distributing -member 36 separably fitted in the body 20 and havingan angular passage 37 communicating with said seat and with theinlet-passage 21. The passage-37 opens to an annular groove 37a in theouter face of the member 36 whereby said member is operative in anyposition in which it may be fitted. The valve element 25 is formed atitslower end with a valve face 38 for'cooperation with the seat 34 and atits upper end `with the valve face 39v for cooperation with the seat35.

The valve element is preferably also.

formed along its body with projecting guide lugs 40 which center it inand spaceit from the cylindricalwall ot the chamber 23. For the purposeof its operation the valve. elevment is provided kwith an axiallyextending stem 4l which operates in a -suitable gland or box 42 andprojects beyond the casing 20.

Said stem is provided at its upper end with a head 43 coacting with theoperating mechanism to effect the upward movement of the v lve elementand with a helical spring 44 to eltect the downward movement' of saidelejment, the spring bearing against a suitable abutment 45 secured tothe easing.

During the outward movement of the plunger 28 the valve element is inits lower position with its valve tace 38 upon the seat mim. mi

Emu@

tion mi' muy 'im @Hummm ii-w Mm @mi @if the arm in @j iww wutinwwl idw@il in 15h@ Chamber Q53 is jfmwzmi H'mwmgh the dwelling@ pusmge andthan@ l'@ th@ mgm@ cyuder. The injcton Hwa efcid is @@MEzlmed unbl th@mm 53 is zf'ted in th@ mmlmim described to dsengage ih@ tooth, :36 mndreleae the ever 54 whereupon the spring' 4A moves the valve element toits lower position wherein the passage" 22 If nowthe inward movement ofthe plunger continues the-oil remainingin the chamber 23 will be 'forcedback-into the passage 21. These operations having taken place, thereceding'face of the cam engages the end of the arm l whereupon thelever'49 is operated in the reverse direction by the spring as it efectsthe outward movement ofthe plunger 29. During such outward movementacharge of oil is drawn into the chamber23. The arm 53 at the same timeis moving inwardly i. e. to the left, the drawing being considered, andduring its inwardmovement the vtooth 57 rides over andsnaps past .thetooth 56 of the lever 54 and is ready toen' gage the same during thenext reverse movement of the arm 53.

Referring to Figures 7 to 11:. 1 l Inthese FiguresI have illustrated anal# "ternative form of operating` fmechanism wherein the movements oftheparts are prol duced by two cams 63. and 64 mounted upon .a shaft 47awhich is driven from thejcrank shaft of theengine. The `cam 63cooperates with a lever65 mounted upon'an arbor 66 and having an upperarm 67 vwhich is en# gaged by said cam and a lowenarm 68 which engagesthe plunger head 29. The lever .65

and cam 63 are thus employed for theoperation of the plunger 28.-. Thevalve stem head 43' isengaged by an operating lever 51.1.a pivotallymounted on a pin 69 and having beyond said 'pin an upward` extension ,70which is engaged by the cam64. The pin 69 is mounted on an arm 71 inturneccentrically mounted, as at' 72, the arbor of thev eccentric 72being preferably connected by suitable means (not shown) to the usualgovernor.

At the lowerA side of .the'eccentric 72, the arm 71 carries anadjustable horizontal pin 73 which during lthe inward movement of thearm 68 'of .the lever 65 isengaged by said arm. The pin 69fnormallybears against a pivotally Aadjustable stop 'arm A74 against which itispressed by'a spring-loaded stem 75 fitted in and movable radially withrespect to the arbor 66. The operation generally is as follows,clock-wise.movements of the cams 63 and 64 being assumed:

The two arms ofthe levers 65 are of course moved in reverse-directions.The drawings being considered, the arm 6 8 is movedv left or inward andeffects the movement -of the plunger on its injection stroke. The arm 68at a period of such .inward movement engages the pin 73 and rockstheiarm 7l outward or toward the right, the drawings'beingv con-Asidered, against the pressure of. the spring'- loaded stem 75.v lBy suchmovement of the arm 7l`the pin 69 is shifted to the right Ao`f the-eccentric 72 from lthe governor the whereby the level' 54a may movedownwardly l under thepressure of the spring 44 with rcsultant movementof the valve element 23 to its lower position and, the vinward movementof the plunger contini1ing,`any oil in the valve chamber 23 is returnedas above described to the passage 21.

By adjustmentl of the pin 73 the period at which said pin is engaged bythe arms 68 may'.4 be ordered and inA this way the period at which theinjection terminates maybe regu-- lated. VThe spring, 28 acting throughthe plunger head 29 effects the return movement of the lever 65 andduring such operation the end of the arm 70 rides on the recession Q80surface of the cam 64 and the valve 25 is maintained in its lowerposition whereinthe discharge passage 22 is cut off from lthechamber-23'aud said chamber through the passage 37 is open to thepassage 2l, oil at 85 'such time beingzdrawn into the chamber 23.

varm 74 the ,point at which the injection commences may beregulated. Bythe movement 90 duration "of .the rejection and henceuthe power isautomatically regulated in accordanc'e with 4the' conditions.

It will be obvious that the details of structure and arrangement of thefuel in-l jecdtion pump may be varied or modified without departing fromthe principles of structure and operation described. It will j also beobvious that the operating mechanism may be modified in respect-to itsdetails or l0 even incorporated in forms substantially differentl fromthe for-ms shown. Hence the foregoing description .of the specificfeatures of the structures disclosed is not to be taken as imposing anylimitation on the appendedv claims not inherent in'their terms.

Havingfully described my invention, I claim: Y

1.`In a fuel injection pump for oil burning engines,in-combination, a`casing having 110 an oil inlet passage, an oil discharge passage and avalve chamber intermediate said pas- Sages and formed vwith spaced seatscommunicating with the respective passages, a valve element in saidchamber movable to different positions in which it has closingcooperation with'. the respective seats, said valve element having anoperating part Iwhich projects beyon'd 'said casing,'a pump chambercommunicating with said valve chamber intermediate said seats anda'pum'p element in said pump chamber. v

2. In a fuel injection pump for'oil burning engines, in combination, ac'asing having an oil inlet passage, an oil discharge passage and avalve chamber intermediate said pas-` sages and vformed with opposedseats com'- municating with the respective passages, a reciprocatoryvalve element in said chamber having opposed valve faces to cooperatewith movable te inlill'erent pe ilinne in wliieli il has closingeeepeisiflien'willi 'lzlie ll'epee'live seele, eind veleve elementliiiirinp; en epeieling part which piejeclzs beyond :senil eeeinp :i

pump eliemliei' eeniinunieziliing willi will. valve chamberinlei'inecliplge miel seele endl a pump eleinenp in Seial pnn'ipelieinliei.

4. In e luel injeetien pump lei' eil linining engines, in.eeinliineliein e easing* lieving an oil inlet peersegeg en eillieelizlifge palen? l@ and a Valve elieinliei in'leirineeliele e irlpelesages and 'lownecl Willi eppeeeil ee i munieating "Wilililzl'ieiespeeliw'e pileei jee, n, spring leaded i'eeipieeelepy velve eleinenlAin seid elie'inljei' lislfvlngg eppeeed 'Welpe :levee to cooperate Willillie i: 'peeliife eeelee eeicl Valve elemenl lnlfvinp; en epewilingpeil; which projectie ljejyentl llie il. pninp cyllinlcler`eeinmunieeling i ill 'mlm chamber inleirineclielJ `nil incl e springloecleel plnnl i in will, ejylinileix 5. In e fuel injeetien pmnp leieil lnnin`l ing engines, in eeinliineliem ai eeeinp; limingi; im @ilinlet peeeege, :in eil lflleelmi-gge paie sage and e Welpe eliemleei'in'beiniieeliele Seial passages enel formeel 'willi eppeeell eezilgeCommunicating Willi llie iespeelive pessepges, a, spring lemlefli'eeipieeeleiy mlm eleinenl; in said chamber limingg eppeseil Welpe'sieee te Cooperate willi the iefipeeliive Seele7 eziiel' valve elementimi/ing en epeielinp; stein which plojeelzs lieyeml llie emingf, e pumpChamber eemmnnieziling willi will "valve chamber inteln'lezliele eeielseele mill el pump element in seirl pninp elisiinlie end epei'efl-- ingmeeheniein een'ipiieingi" e. continuously' rotatable shall, 'ineensepeinlefl liy Sei'fl shell Ifor eetuetinp; seid plungeru ineensepeieliefl by. Seel slmlfl; lei nimf'inp' Heifl vulve elem in Oppeellionle llie leading spring' el seuil Vallee elenienl; will ineene epei'eleillip eeiil el f el; e pelieil. el eaell iwvelnliieii for permittingeeill. lending sipping' lie nella.

ll. ln e :l ing eneinefflJ in eemliinution, e seeing lieving en eilinletJ priieeege, im oil dieelmrpje passage enel, e, willie elnnnlael'intermediate Seid' pee-- el L:ee enel lieifineel Willi. eppeeecl eeelieeeinnninieelinp)V 7willi lille respective pmfegeele sipping leefleelifeeiplpeillery Yell ement in eeifl. elieinliei' liesfing; eppeeeellfelpe 'lie-eef; le eeepeiele' Willi. the respectieve sieg seid willieelement leaving an opel-ii np; elem which plejeelge 'beyond lilleeessinpp e pump elleniliei eeinlnnnieating Willi eiliil valveelle-pilier intermediate Seidl Seele enel e, piunp element in selflpumpellzunlfiei epfl epei'etinp; :ineelieniem comprising a, eenliimenelyi-elielillile shell, e, lever' epeiselefl l'iy eaifl Shell lei eelnetingseid plunger, e Second lepell epeieleil lay seid shell; ler eelnetingmiel valve eleinenl against lzlie pressure et' ile leerling epiinp; end.means-1 epeielziwe el' e pei'iecl elf eeeli revolution eli eeiileliell', fm* jpeieniil'lvingi' lille nperelieri el :mill 'Welpeelenienli lijp ilie lemiling Spring.

ln :i luel injection pnn'ip leif'eilqlininii iirpnne-f-s7 ineeinbinetien, e, el :sing: limfing en eil inle pee ige, en eil(lisieliei'pge llieeeege anal :i "veline elieinbei: inlein'eflielzeeeifl pee ein@ e empl 'leiniefl Willioppeeeel eeille eenin'ninieeling,willi the i'eepeelilne pneeL sipping' leeelerl ieeipieeeteiy if'elifeelement in sei-lil eliziinliei lie'ving eppeeecl ielve leees leeeepeielze Willi llie respective imite, said 'Willie element liefvinp;an epeiel np; stele wliieli piejeele luejlfenel tlie ecieingiy e, pumpelieinliei eeinnienkeling Willi veline elieinliei' inlei'ineclieleeeill. seele einil e pump elenien l. in eelicl pninp eliemlnei zlnilnpei'efting ineelmniein eeinpiieinpg e eUni/innel'ielp inleit fileleeliell, lewe @eine en eeifl elmilll) ene eem 'llie ether eem sewing;lfm." llie eelnellien 0i' e peiiocl el eneli revolution el' millfiliali; for

pei'iniliflin@I lille epeiel'ien el' seid Welpe ele v' nient by ilelemling Spring. p

ln leebnneny wlieii'eeli l. liei'eifvilli e'l'lnf; nijl7 nip signelinie.,

el injection pump lei* nil lnun

